Lens barrel and imaging apparatus

Abstract

A lens apparatus includes an optical system, a holding barrel configured to hold at least part of the optical system, an electric unit attached to the holding barrel, a control board configured to control the electric unit, a flexible printed circuits board configured to connect the electric unit and the control board to each other, a holding member attached to the holding barrel and configured to hold the flexible printed circuits board, and a fixing member configured to attach the holding member to the holding barrel. The flexible printed circuits board includes a first bent part, and the fixing member has a receiving surface configured to receive a reaction force from the first bent part.

What is claimed is: 
     
       1. A lens apparatus comprising:
 an optical system; 
 a holding barrel configured to hold at least part of the optical system; 
 an electric unit attached to the holding barrel; 
 a control board configured to control the electric unit; 
 a flexible printed circuit board configured to connect the electric unit and the control board to each other; 
 a holding member attached to the holding barrel and configured to hold the flexible printed circuit board; and 
 a fixing member configured to attach the holding member to the holding barrel, 
 wherein the flexible printed circuit board includes a first bent part, and the fixing member has a receiving surface configured to receive a reaction force from the first bent part, and wherein the flexible printed circuit board contacts the receiving surface of the fixing member and thereby the flexible printed circuit board sandwiched between the receiving surface and the holding member is positioned. 
 
     
     
       2. The lens apparatus according to  claim 1 , wherein the first bent part of the flexible printed circuit board is provided in a routing range between a connector of the flexible printed circuit board with the electric unit and the holding member. 
     
     
       3. The lens apparatus according to  claim 2 , wherein the flexible printed circuit board has a branched part in the routing range, the first bent part includes at least part of the branched part, and the receiving surface of the fixing member receives the reaction force from the branched part. 
     
     
       4. The lens apparatus according to  claim 3 , wherein the branched part is of a line symmetry with respect to a line that is parallel to the optical axis and passes a center of the fixing member. 
     
     
       5. The lens apparatus according to  claim 3 , wherein the fixing member has a shaft part, and the branched part has an opening larger than a projected shape of the fixing member in a radial direction orthogonal to the optical axis. 
     
     
       6. The lens apparatus according to  claim 5 , wherein the opening is larger than a projected shape of the receiving surface of the fixing member. 
     
     
       7. The lens apparatus according to  claim 6 , wherein the branched part has an end that is smaller than the projected shape of the receiving surface of the fixing member and larger than the shaft part, and
 wherein the flexible printed circuit board is positioned when the shaft part contacts the end. 
 
     
     
       8. The lens apparatus according to  claim 5 , further comprising a reinforcing member that contacts the shaft part of the fixing member. 
     
     
       9. The lens apparatus according to  claim 1 , wherein the holding member holds the flexible printed circuit board along an optical axis direction. 
     
     
       10. The lens apparatus according to  claim 1 , wherein the flexible printed circuit board contacts the receiving surface of the fixing member and thereby is positioned in a radial direction orthogonal to an optical axis direction. 
     
     
       11. The lens apparatus according to  claim 1 , wherein the fixing member attaches the holding member to the holding barrel in a radial direction orthogonal to an optical axis direction. 
     
     
       12. The lens apparatus according to  claim 1 , wherein the holding barrel is movable along an optical axis direction. 
     
     
       13. The lens apparatus according to  claim 1 , further comprising a reinforcing member that contacts the receiving surface of the fixing member. 
     
     
       14. The lens apparatus according to  claim 13 , wherein the reinforcing member further contacts the holding member. 
     
     
       15. The lens apparatus according to  claim 1 , wherein the receiving surface of the fixing member and a guide surface are parallel to each other and do not overlap each other, and
 wherein a distance between the receiving surface and the guide surface is equal to or smaller than a thickness of the flexible printed circuit board in a direction perpendicular to the guide surface. 
 
     
     
       16. The lens apparatus according to  claim 1 , wherein the flexible printed circuit board has a second bent part that changes a position as the holding barrel and the control board move relative to each other, and
 wherein the holding member has a guide surface configured to guide a relative movement of the second bent part. 
 
     
     
       17. An imaging apparatus comprising:
 a lens apparatus; and 
 an image sensor configured to photoelectrically convert an optical image formed by the lens apparatus, 
 wherein the lens apparatus includes: 
 an optical system; 
 a holding barrel configured to hold at least part of the optical system; 
 an electric unit attached to the holding barrel; 
 a control board configured to control the electric unit; 
 a flexible printed circuit board configured to connect the electric unit and the control board to each other; 
 a holding member attached to the holding barrel and configured to hold the flexible printed circuit board; and 
 a fixing member configured to attach the holding member to the holding barrel, 
 wherein the flexible printed circuit board includes a first bent part, and the fixing member has a receiving surface configured to receive a reaction force from the first bent part, and 
 wherein the flexible printed circuit board contacts the receiving surface of the fixing member and thereby the flexible printed circuit board sandwiched between the receiving surface and the holding member is positioned.